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VERTICAL OR HORIZONTAL VENTING USING
SECURE FLEX
KITS AND COMPONENTS
Secure Flex venting kits and components may
be used in any venting application in place of
rigid Secure Vent (SV4.5) direct vent compo-
nents. All restrictions, clearances and allow-
ances that pertain to the rigid piping apply to
the flexible venting. Secure Flex kits may not
be modified; also, under no circumstances
may separate sections of flex pipe be joined
together.
Using adapter (SV4.5RF), Secure Flex kits may
be added to the end of a vent run made up of
rigid Secure Vent (SV4.5) vent sections pro-
vided that doing so does not violate any of the
venting length, height, routing, horizontal to
vertical ratio requirements or clearance consid-
erations detailed in this manual.
Secure Flex kits come with an adapter that can
be fitted to the inclined channel end of the last
Secure Vent (SV4.5) vent section in a rigid
system in the exact same fashion as any other
f i r e - p a r t s . c o m
Secure Vent section.
Align the dimpled end of the adapter over the
previously installed section or appliance collar,
adjusting the radial alignment until the four
locking dimples of the adapter are aligned with
the inlets of the four incline channels of the last
vent section or collar. Push on the adapter until
it fully engages, then twist the adapter clock-
wise running the dimples down and along the
incline channels until they seat at the end of the
channels.
Attach the flexible vent to the adapter as
follows (see also Figure 45):
A. Install the Inner Flex Pipe -
1. Install the small gear clamp loosely
around the inner flexible vent pipe, push it
back out of the way.
2. Apply a bead of Mill-Pac Black (700°F)
high temperature sealant - Catalog No.
10K81) to the inner adapter collar, approxi-
mately ¹⁄₂ inch from the end.
3. Pull and extend the inner flexible vent
pipe.
4. Slide the inner flex pipe over the adapter
collar. Ensure the flexible vent pipe com-
pletely engages the adapter collar to a dis-
tance of 1³⁄₄ inches from the end, and that
it is free from damage or tears.
5. Slide the gear clamp down and tighten it
fully to secure the flexible vent to the adapter
inner collar approximately ³⁄₄ inch from the
end of the flex.
6. Install three screws 120 degrees apart
through the flexible vent pipe and into the
adapter collar just below the gear clamp to
provide additional security to the connection.
20
NOTE: OUTER PIPE IS PULLED AWAY TO
SHOW THE DETAIL OF THE INNER PIPE
Apply ONLY MIL-PAC BLACK HIGH
TEMPERATURE SEALANT (Catalog
No. 10K81) to the outside surface
of both collars of the adapter (be
especially careful to fill the grooves
of the outer collar to be covered by
the flexible pipe) and slide flexible
pipe over inner and outer adapter
collars.
1³⁄₄ in. (44 mm)
Flexible Pipe and
Adapter Outer Collar Overlap
Adapter
(SV4.5RF)
Figure 45
B. Install the Outer Flex Pipe -
1. Install the large gear clamp loosely around
the outer flexible vent pipe, push it back out
of the way.
2. Apply a bead of Mill-Pac Black (700°F)
high temperature sealant - Catalog No.
10K81) to the outer adapter collar; to the
grooves of the collar which extend approxi-
mately 1 inch from the end and to the flat
surface, approximately 1³⁄₈ inches from the
end.
3. Pull and extend the outer flexible vent pipe.
4. Slide the outer flex pipe over the adapter
collar. Ensure the flexible vent pipe com-
pletely engages the adapter collar to a dis-
tance of 1³⁄₄ inches from the end, and that it
is free from damage or tears.
5. Slide the gear clamp down and tighten it
fully to secure the flexible vent to the adapter
outer collar approximately ³⁄₄ inch from the
end of the flex.
6. Install three screws 120 degrees apart
through the flexible vent pipe and into the
adapter collar just below the gear clamp to
provide additional security to the connection.
C. Route Flex Vent -
Ensure that the flex vent is properly routed to
provide the required clearance. Do not allow
the flexible vent to bend in a radius tighter than
5" (127 mm). Refer to Figure 46 . Space out the
internal flex vent spacers evenly - approxi-
mately every 6 inches - and avoid kinking of
inner pipe. Support horizontal sections of flex
with metal straps at 2 foot (0.61m) intervals.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
(3 PLACES EQUIDISTANT
JUST BELOW GEAR CLAMP)
Flexible Pipe and
Adapter Inner Collar Overlap
(3 PLACES EQUIDISTANT
JUST BELOW GEAR CLAMP)
Attach Adapter to Appliance
Collar, or Secure Vent Sections
D. Install Firestop/Spacers at walls and
Firestop Thimbles at ceilings and roofs -
When Secure Flex penetrates a wall use the
SF4.5 HF firestop/spacer. See the appropri-
ate sections and figures shown throughout
the venting section for their installation re-
quirements. When Secure Flex penetrates a
ceiling or roof use the appropriate firestop
thimble listed in the Table on page 24 and
described in Figures 21 and 22 on page 11 .
Figure 46
E. Attach Flex Vent to Termination -
Secure Flex components can be purchased
separately and attached to bulk lengths of
Secure Flex flexible tubing cut to size at the
job site. Secure the flexible vent to the Secure
Flex terminations in the same manner (see
Figure 45) as it was attached to the adapter.
FLEX VENT
SECURING SCREW
GEAR
CLAMPS
1³⁄₄ in. (44 mm)
SECURING SCREW
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